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| 2006-03-23 // Pulse Offers Off-the-Shelf High Efficiency Transformers for Power over Ethernet Applications |
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 UR (www.ur-home.com) introduces a series of 16 Scalable Modular And Robust Technology announces a series of high efficiency, small footprint, off-the-shelf power transformers for powered device (PD) side Power over Ethernet (POE) products that meet IEEE standard 802.3af from its partner Pulse Engineering (www.pulseeng.com)
These parts have been tested and approved for use with many of the most popular PoE ICs and are available in standard output voltages from 3.3 Volts (V) to 12V. Purchasing standard PoE transformers off-the-shelf significantly reduces the lead time and cost and makes them readily available and economical for small volume PoE applications that do not warrant the design of custom transformers. The PoE series consists of twenty-two powered device (PD) side PoE transformers for 3 Watt (W), 7W and 13W output power levels. The Pulse transformers have 50 percent lower leakage than other PoE power transformers, reducing the need for inefficient snubber circuits and increasing overall power supply efficiency. Power supply efficiency is crucial for PoE applications because limited input power is available over the Ethernet cable. Higher efficiency transformers directly increase the amount of power that can be delivered to the powered device.
The Power Sourcing Unit (PSU) delivers a loosely regulated 48V (33-75V) input to the powered device over the Ethernet cable. The powered device converts the 48V input to a regulated output voltage at the required power level. The PoE standard allows the PD to request one of three levels or classes of power: 3W/Class 1, 7W/Class 2, and 13W/Class 3. Pulse has designed 3.3V, 5.0V, and 12.0V output voltage transformers at each of the three power levels. Three sizes of power transformers and three output voltage levels for each power class allow designers to select the smallest and most efficient package for the class of PoE device they are designing and to use standard, off-the-shelf components. The Pulse PoE series transformers are designed for continuous mode flyback topologies operating between 200 and 400 kilohertz (kHz). This topology has been chosen by all the major power IC vendors because it is the least expensive and produces 90%+ efficiency. The 1500 root mean square of voltage (Vrms) isolation between primary and secondary windings meets the isolation voltage specification for PoE applications as defined in the IEEE 802.3af standard. Each transformer has a primary side auxiliary winding to supply input power to the power IC, further reducing power loss.
These Pulse PoE series transformers maximize the usage of available height and minimize PCB footprint. The footprint of the 13W/Class 3 output transformers is 40% smaller than competitive packages. Industry standard footprints provide the opportunity to develop a second source, if required. The footprints are 13.2mm x 10.7mm for the EP7 (8-pin SMT, 3W/Class 1), 15.2mm x 12.7mm for the EP10 (10-pin SMT, 7W/Class 2), and 17.8mm x 12.7mm for the EP13 (10-pin SMT, 13W/Class 3) transformer.
Applications for the PoE series include Voice over Internet Protocol (VoIP) phones, security cameras, web cameras, wireless routers, gaming machines, retail point of information systems, building access control systems, and battery chargers for mobile phones and PDAs. “The IEEE 802.3af specification standardizes the requirements for delivering power to electronic devices over Cat5 Ethernet cables making standard, off-the-shelf PoE transformers possible.
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| 2006-02-16 // New Ultra-miniature Crystal Clock Oscillators Enable Smaller Platforms, More Features |
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 UR, (www.ur-home.com) sales channel partner of Pericom Semiconductor Corporation is announcing the initial release of the SaRonix S1643 and S1644 product series of quartz crystal clock oscillators contained in an ultra-miniature 3.2 x 2.5mm package. These new oscillators, manufactured at Pericom’s recently acquired eCERA factory in Taiwan, are mounted inside a small form-factor and robust ceramic package that is designed for high-density or portable electronic applications. Featuring operating frequencies from 1.8432 to 106.25MHz with 3.3V and 2.5V LVCMOS interfaces, the S1643/44 series are ideal for use in small form-factor hard disk drives, GPS devices, portable multimedia players or recorders, digital cameras, blade servers, switches & routers, portable/personal computing devices, wireless access devices, PON and SOHO networking equipment.
Last November, Pericom/SaRonix introduced its first crystal resonators in the 3.2 x 2.5mm package (NKS3 series), which distinguished Pericom/SaRonix as a leader in small packaging and manufacturing technologies for quartz crystals. Today, Pericom breaks new ground by incorporating both a crystal resonator and an integrated clock circuit (clock IC) into this ultra-miniature package to deliver the new S1643 and S1644 crystal clock oscillator products. Pericom is one of only a few companies worldwide that has in-house, high-volume production capacity for this type of product. Furthermore, our manufacturing processes and product designs enable us to achieve, in a cost-effective manner, the strict performance requirements of WiFi and industrial operating temperature applications, thus providing the S1643/44 with competitive size, performance, and cost advantages.
The S1643 and S1644 products are packaged in a hermetically sealed industry-standard 3.2 x 2.5mm ceramic package that is seventy-five percent (75%) smaller than the popular 7x5mm clock oscillator package. This reduced package size facilitates the size-reduction of customers’ platforms or the addition of more features/functions to existing platforms. The S1643/44 clock oscillators utilize the favorable properties of AT-cut quartz to produce a specified output clock signal between 1.8432 and 106.25MHz. Powered with 3.3V or 2.5V supply, the S1643/44 crystals use a non-PLL clock circuit to achieve low output jitter and rather low current consumption – rated 8mA max (up to 50MHz) and 15mA max (up to 106.25MHz) – ideal to for battery-operated or high-density PCB applications requiring low power dissipation. Moreover, the products achieve an impressive ±25ppM total accuracy over commercial operating conditions and ±50ppM total accuracy over industrial operating conditions, performance that is critical for wireless applications such as GPS, Bluetooth, WiFi, GSM, and WiMax. The devices are available on tape and reel for automated pick-and-place assembly, are RoHS-compliant, and are compatible with Pb-free reflow soldering guidelines.
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| 2006-02-08 // RoHS-compliant 150 Watt AC-DC Power Supplies |
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 High density 5 x 3 x 1.25 inch package suits 1U-high rack equipment
Low airflow requirements: convection-only to 100 W, then just 200 LFM to 150 W
UR (www.ur-home.com) introduces a new series of compact 150 Watt ac-dc power supplies from its partner ARTESYN TECHNOLOGIES) that are ideal front-end conversion solutions for systems with distributed power and point-of-load architectures. The new TLP150 series power supplies provide a choice of 12 V, 24 V or 48 V outputs to simplify system integration, backed by extensive control and monitoring features to satisfy a wide variety of dc supply requirements. For distributed power applications, the 12 V model can be used to directly power boards fitted with multiple non-isolated point-of-load (POL) dc-dc converters, while the 24 V and 48 V models are suitable for feeding on-board isolated brick or intermediate bus converters. The 24 V model is also ideal for powering equipment with electromechanical loads such as relays, pumps and print-heads. In addition to the main output channel, each power supply also provides a 12 V output for powering fans, and an auxiliary ‘always-on’ 5 Vdc output for applications that require standby operation is available as an option.
All TLP150 series power supplies are Pb-free (RoHS 6/6) compliant. The 12 V and 24 V models are also available with full medical approvals, for applications such as patient monitoring systems and other portable equipment used in medical wards and surgical operating theaters. The medically approved versions have a very low safety ground leakage figure of 150 μA, compared to 1 mA for the industrial versions, and are equipped with fuses in both live and neutral inputs. TLP150 series ac-dc power supplies employ an open-frame construction, combined with highly integrated layout and packaging techniques, to realize a small form factor, high functionality unit capable of delivering high levels of useable power. Measuring just 5 x 3 inches, with a profile of only 1.25 inches, the supplies have a power density of 8 Watts per cubic inch. The main output channel can deliver up to 100 Watts continuously under free air convection conditions, rising to 150 Watts with just 200 LFM forced air cooling. The power supplies accommodate a wide ambient operating temperature range of 0 °C to 70 °C, maintaining full rated output up to 50 °C.
All TLP150 series power supplies feature a universal input that accepts any voltage in the range 85 to 264 Vac at any frequency from 47 to 63 Hz, enabling them to be used in equipment destined for any part of the world. Active power factor correction minimizes input harmonic current distortion and ensures compliance with the international EN61000-3-2 standard. The power supplies employ the latest high frequency switch-mode technology to maximize conversion efficiency, typically achieving 81% at full load with a 115 Vac input, and 84% with a 230 Vac input. Primarily intended as low- to medium-power front-end units for distributed power systems, the small physical size and high functionality of TLP150 series ac-dc power supplies makes them especially suitable for use in information technology equipment (ITE), light industrial systems and medical equipment.
Built-in control and monitoring features include ‘ac power good and ‘dc power good’ output signals and a remote on/off input, and the supplies are comprehensively protected against overcurrent, overvoltage and overtemperature conditions. TLP150 series 12 V, 24 V and 48 V power supplies provide maximum main channel output currents of 12.5 A, 6.3 A and 3.2 A respectively. Active ‘democratic’ current sharing, enabling multiple units to be connected in parallel for higher current applications, is available on select models. These models also incorporate internal Or-ing diodes fitted to the main output, for fault-tolerant and N+1 redundancy applications.
The main output channel voltage of each supply can be adjusted 10% either side of nominal via an internal trim potentiometer, and regulation is maintained to within ±3% for all line and load conditions. Differential remote sense facilities are provided to compensate for up to 0.2 V drop between the main channel output terminals and the load. The auxiliary 5 Vdc output is regulated to within ±5% and can deliver up to 1.0 A; it is primarily intended for powering ‘standby’ circuitry that needs to remain on for most of the time, such as power-up/down sequencers, and is unaffected by the on/off status of the main output channel. The auxiliary 12 V fan output can deliver up to 0.5A and is present whenever the main output channel is on. All TLP150 series ac-dc power supplies comply with the rigorous EN55022-B and FCC part 15 Level B EMC standards for conducted noise and meet all applicable immunity standards, including EN61000-4-2, -3, -4, -5 and -6 levels 3. The power supplies carry UL/cUL60950-1 and EN60950-1 VDE safety approvals, and the medical versions are also approved to UL/cUL2601-1 and VDE EN60601-1. The standard industrial versions of the supplies have isolation ratings of 3000 Vac input/output and 1500 Vac input/chassis, while the medical versions have higher 4000 Vac input/output ratings.
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| 2006-02-03 // UR highlights the iMP Series AC/DC Power Supplies from its Partner ASTEC |
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 Power Feature Product Highlight of the Month
• Intelligent Power Supply, I2 Control
• 600-1500 Watt
• Full Medical Approval EN60601
UR (www.ur-home.com) highlights a new generation of switching power supplies featuring sophisticated digital management capabilities from Astec Power (www.astecpower.com). Along with digital control, the new iMP Series offers a range of hardware modules that will give designers the ability to tailor solutions precisely to their individual needs with single, dual, and triple output modules in power ratings from 600W to 1500W.
Modules can be configured in a selection of four customizable MP cases accepting input voltages from 85VAC to 264VAC or 120VDC to 350VDC. Cases can accommodate up to seven individual modules with a choice of outputs ranging from 2VDC to 60VDC.
In addition to having 50 percent higher power density than previous generation products, this new breed of switching power supplies uses integrated digital capabilities to provide smart communication and programmable control features that will enable designers to precisely fine tune power for their needs throughout the development process.
The easy-to-use microprocessor interface allows designers to make adjustments to a host of parameters including: voltage, current, fan speed, sequencing, power factor correction, inrush and more. In spite of the advanced feature set, designers should find that this new digital generation of intelligent switching power supplies be price competitive with existing technology.
Using the iMP Series intelligent I2C control, designers can program key features on each output, including:
• Output Voltage
• Output Enable/Sequencing
• Module Inhibit/Enable Polarity
• DC OK Thresholds
• Output Current Limit Set-Point and Type
• Overtemperature Threshold
With the increasingly popular I2C communication protocol, these systems will also be able to capture configuration and use information as well as parametric data for each output. Backed by a two-year warranty, the iMP Series products meet worldwide safety and performance standards including listings from UL and CE as well as full medical compliance with EN60601. Because the modular design enables more than 200 million combinations, pricing will vary based on configuration.
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| 2006-02-03 // UR Introduces SMART Series of xDSL Integrated Splitter/Filter Modules from Pulse Engineering |
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 Fully tested electrical modules meet all international standards for worldwide applications
UR (www.ur-home.com) introduces a series of 16 Scalable Modular And Robust Technology (SMART™) xDSL integrated low-pass splitter/filter modules from its partner PULSE (www.pulseeng.com) . Pulse’s modules are used in telco central offices to achieve excellent voice quality by separating voice and data signals and filtering interference out of the data signals in xDSL applications. These fully tested filters are complete, ready-to-use electrical modules, so system integrators need only
supply the mechanical functions to the splitter board. These patent-pending modules provide broadband equipment vendors with a convenient and cost-effective splitter solution to meet fast changing customer and technology demands.
Because they integrate up to 15 inductors, capacitors and resistors into a fully tested, compact, through-hole package, the Pulse filter/splitter modules save the considerable time and expense of building filters from scratch. Pulse’s splitter/filter modules meet the full range of ANSI, ETSI, and ITU standards for ADSL and ADSL2+, thus covering all xDSL applications worldwide. Some VDSL2 compatible modules are already available. Some Pulse models have additional features such as a signature circuit, used in the United States to automatically detect the presence of a splitter on the line. An embedded signature circuit makes this operation possible; otherwise it has to be done manually. Models including protection devices to meet K20 or K45 enhanced are also available for over-voltage and over current protection. Pulse’s SMART series of splitter/filter modules are pin-to-pin compatible so that the same board layout can accommodate different standards for different countries by just changing the component. Compact designs allow high integration (number of lines per board). The SMART modules support plain old telephone service (POTS), integrated services digital network (ISDN), and voice over Internet protocol (VoIP) installations. They can be used in Central Office (CO) applications as single-line low-pass filter solutions mounted on the digital subscriber line access multiplexer (DSLAM), multi-service access node (MSAN) splitter board, or main distribution frame (MDF). They can also be used in customer premises equipment (CPE) applications enabling the low-pass filter function to be embedded inside the modem
or home gateway.
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